Lawn sprinkler



Jan. 16, 1962 RINKEWICH ETAL LAWN SPRINKLER 4 Sheets-Sheet 1 Filed Feb. 10, 1960 Jan. 16, 1.962 RINKEWICH ETAL LAWN SPRINKLER 4 Sheets-Sheet 2 Filed Feb. 10, 1960 INVENTORS ASH/i6 imam-Maw //a c/rwv BY ,yrrarmsrs Jan. 16, 1962 l. RINKEWICH ETAL 3,017, 3

LAWN SPRINKLER Filed Feb. 10, 1960 4 Sheets-Sheet 3 Jan. 16, 1962 l. RINKEWICH ETAL 3,017,123

LAWN SPRINKLER Filed Feb. 10, 1960' 4 Sheets-Sheet 4 FIG. 9

Array/tan a e e 3,017,123 Umtfid States Patent Ice Patented Jan. 16, 1962 3,017,123 LAWN SPRINKLER Isaac Rinkewich, Brooklyn, and Ho Chow, Yonkers, N.Y.,

assignors, by mesne assignments, to International Patent Research Corp., New York, N.Y., a corporation of New York Filed Feb. 10, 1960, Ser. No. 7,876 19 Claims. (Cl. 239-230) The present invention relates to a lawn sprinkler in which the areato be sprinkled is readily selected and controlled. In its more specific aspects the invention is here disclosed as embodied in an impulse-type sprinkler in which the sprinkler nozzle is rotated in a step-by-step manner, impelled by a hammer acted upon by the stream of water issuing from the nozzle.

It is, of course, highly desirable that the sprinkler be adaptable to water either an overall area or a selected portion thereof, and various types of mechanisms have been devised in the past to achieve this result. The structure of the present invention, in its broader aspects, is characterized by the fact that the area to be sprinkled is controlled by a pair of elements adjustably positionable on the sprinkler, which elements, when once manually positioned, remain fixed relative to the ground on which the sprinkler rests. These elements are provided with indicators having a direct visual relationship to the limits of the arc of rotation of the nozzle which are determined by the positioning of those elements. Thus with the sprinkler in position on the lawn surface the adjustably positionable elements are so located that their indicators line up with the outer limits of the particular area to be sprinkled. Hence the proper setting of those elements is readily and accurately accomplished in a relatively foolproof manner, and since the elements remain stationary while the nozzle moves the area to be sprinkled is always visually indicated independently of the movement or position of the nozzle.

Means are also provided for selectively conditioning the sprinkler either to rotate back and forth over a limited arc as determined by the setting of the adjustably positionable elements so as to sprinkle an area defining a sector of a circle or to rotate continuously in the same direction independently of those elements so as to sprinkle a circular area completely around the sprinkler itself. The conditioning of the nozzle to rotate in either of these modes is accomplished by means of a member accessible at the exterior of the sprinkler mechanism.

The adjustably positionable elements are preferably located at the top of the sprinkler assembly, where they are readily accessible for manipulation and setting. They are mounted on a stationary and vertically extending support member on which the sprinkler nozzle is rotatively mounted. The lower portion of that support member is provided with a fluid passage which communicates with the nozzle, water flowing through that passage into and escaping from the nozzle. The water path is located beneath and is effectively and reliably sealed from the control mechanism, so that the parts of the control mechanism are never subjected to the deteriorating action of the water. Hence the mechanism is long-lived and exceptionally reliable.

More specifically, and having reference to the impulsetype sprinkler arrangement specifically disclosed, the nozzle is rotatably mounted on the lower portion of the vertical extending support member in fluid communication with a passage formed in the lower portion of that member. A hammer arm is rotatively mounted on the support member above the nozzle, is operatively connected to the nozzle by means of a spring, and carries at its extremity a hammer which is acted upon by the stream of water which escapes from the nozzle, thereby to cause oscillation of the hammer arm relative to the nozzle. Mounted on the nozzle and movable therewith is a housing which carries an adjustably positionable anvil having parts adapted selectively to be engaged by the hammer arm as the latter oscillates, thereby to impart impulses to the nozzle, causing it to rotate in one direction or the other in step-by-step fashion, depending upon which of the anvil parts is engaged by the hammer. The adjustably positionable elements which, when once positioned, remain stationary, are provided with stop lugs adapted to operatively engage the anvil when the nozzle has moved as far as desired in a given direction and to shift the position of the anvil and thus cause the nozzle to rotate in the opposite direction. That portion of the anvil which is adapted to engage the aforementioned stop lugs is itself adjustably positionable relative to the anvil, being movable between a first position in which it has a path of travel which brings it into engagement with said stop lugs and a second position in which it has a path of travel which does not bring it into engagement with the stop lugs. Hence when the anvil part is in said first position the nozzle will rotate back and forth over an arc determined by the location of the adjustably positionable elements, Whereas when the anvil part is in its second position the nozzle will rotate continuously, the particular direction of rotation depending upon the position of the anvil itself.

All of the elements of the mechanism may readily be manufactured on a large scale basis without requiring any great degree of precision, and the assembly of the parts is a relatively simple matter. Hence the sprinkler may be inexpensively manufactured.

To the accomplishment of the above, and to such other objects as may hereinafter appear, the present invention relates to the structure of a lawn sprinkler, as described in the appended claims and as described in the specification, taken together with the accompanying drawings:

FIG. 1 is a top plan view of one embodiment of the present invention;

FIG. 2 is a side elevational view thereof;

FIG. 3 is a detailed view on an enlarged scale showing the upper end of the control mechanism and indicating the ready availability for manipulation of the adjustably positionable elements and of the member which conditions the sprinkler either for continuous rotation or for back and forth rotation over a limited arc;

FIG. 4- is a crosssectional view, on an enlarged scale, taken along the line of 44 of FIG. 1;

FIGS. 5, 6, 7, 8 and 9 are detailed cross-sectional views taken along the lines 5-5, 66, 7-7, 8-8 and 9--9, respectively, of FIG. 4; and

FIG. 10 is an exploded three-quarter perspective view showing the various parts which make up the anvil, the mechanism for shifting the position of the anvil, and the mechanism for selectively conditioning the sprinkler for continuous rotation or back and forth rotation over a limited area.

In the form here disclosed the sprinkler is provided with a base 2 on which housing 4 is mounted, that housing having an upwardly extending and internally threaded boss 6 into which the vertical extending support member 8 is threadedly received. The housing boss 6 communicates with a fluid passage 10 in the housing 4 which extends out to a fitting 12 to which a hose is adapted to be secured. The support member 8 has a vertical passage 14 therein which opens into the passage 1-0 and which is provided at its upper end with a plurality of exit orifices 16. The support member 8 adjacent its lower end is provided with a circumferential recess 18 within which a sealing ring 20 is received, that ring normally extending radially out from the recess 18.

The nozzle assembly, generally designated 22, com

prises a central hub 24 from which the nozzle arm 26 extends, the appropriately orificed tip nozzle 28 being inserted in the end of the arm. Secured to the hub 24 and outwardly spaced therefrom is a flange 30, connected to the hub 24 by means of a top wall 32,.and three internally threaded posts 34, 36 and 38 extend up therefrom. The internal diameter of the hub 24 is appreciably greater than the external diameter of the support member 8 over which the hub is received, thereby defining a circumferential space 40 between the hub 24 and the support member 8, with which space the exit orifices 16 in the support member 8 communicate. A passage 42 in the nozzle arm 26 also communicates with the space 40, and, at its outer end, with the nozzletip 28, in which exit orifices 44 are formed. A bearing ring 46 is secured to the interior of the hub 24 adjacent its lower end, as by a press fit. It rests upon a shoulder 48 formed on the support member 8 above the recess 18 and below the exitorifices 16, and rotates with the nozzle 22 over the surfaces of. the support member 8 engaged thereby.

The coil compression spring 50 isreceived within the space 40, and rests upon the upper surface of the hearing ring 46. The gland ring 52 is floatingly received over the upper end of the support member 8, and its lower surface engages the spring 50. The gland ring 52 is pressed down, thus compressing the spring 50, by means of a plate 54 held in place by a shoulder 56 formed at the lower end of the support member extension shaft 58 which is threadedly received in an axial aperture 60 formed in the upper end of the support member proper '8. A'sealing ring 61 is compressibly received within recesses 62 and 64 formed in the upper ends of the gland ring 52, and hub 24 respectively, and is prevented from escaping from those recesses by the periphery of the plate 54.

I A hammer. assembly, generally designated 66, comprises a hub 68 withinwhich an elongated bearing sleeve 70 is fixedly secured, as by a press fit, the bearing sleeve 70 fitting over and bearingly engaging the support member extension shaft 58 and resting upon the upper surface of the plate 54. A horizontal wall 72 extends out from the hub 68 and is provided with three elongated arcuate slots 74 through whichthe posts 34, 36 and 38 extend. Projecting forwardly from the wall 72 (in the same general direction as the nozzle arm 26) is an arm 76 provided on its lower surface near its tip with a boss 78 having an internally threaded aperture 80 and a depending finger 82. The vane 84 is pivotally mounted on screw 86 received within the aperture 80 on the arm 76. The vane 84 is wedge-shaped, having side surfaces 88 and 90 diverging from the vertex 92, the latter pointing toward the nozzle tip 28, the surfaces 88 and 98 extending to wings 94 and 96 respectively, between which the finger 82 on the arm 76 extends.

Projecting rearwardly from the wall 72 (away from the nozzle tip 28) is a second arm 98 having a stud 100 secured Within aperture 102 formed in boss 104 extending downwardly from the arm 98, and tightly coiled spring 106 has one elongated looped end 108 received about the stud 100 and the other end fixedly secured to the nozzle hub 24, as by being retained by means of fitting 110 in recess 112 formed in the hub 24. The spring 106 functions like a leaf spring, resiliently resisting bending, by reason of the slidable relation between its end 108 and the stud 100, and hence prevents binding of hearing sleeve 70 on shaft58. The spring 106 tends to maintain the hammer assembly 66 substantially in line with the nozzle 22, with the vane 84 in front of the nozzle tip 28.

Housing 114 is supported above the hammer assembly wall 72 on the tops of the posts 34, 36 and 38, being there secured by means of screws 116. Its hub 118 loosely surrounds the support member extension shaft 58. so as to be readily rotatable relative thereto. An elongated slot 120 is fo med n e bottom wall 121 f the housing 114.

The anvil, generally designated 122, is pivotally mounted on the underside of the wall 121 and around the upper surface of the post 34, the tip of that post 34 being of reduced diameter and passing through aperture 124 in the anvil 122. A washer- 126 may be interposed between the lower surface of the Wall'121 and the upper surface of the anvil 122, and a second Washer 128 may be interposed between the lower surface of the anvil 122 and the bushing 130 which surrounds the upper tip of the post 34 and is received inside the aperture 124. The anvil is provided with a pair of downturned lugs 132 and 134 adapted to be selectively engaged by pins 136 extending up from the wall 72 of the hammer assembly 66. The anvil is also provided with. an upwardly extending lug 138 which passes through the slot 120 in the-housing wall 121, and with a portion generally designated 140 having a large central aperture ,142' which is loosely received over the bearing sleeve 70. The anvil has a rearwardly extending part 143 which moves between the posts 36 and 38, those posts acting as stops limiting the freedom of movement of the'anvil 122.

Pivotally mounted on the hub 118 is the anvil actuating lever generally designated 144, that'lever 144 be ing retained in place by means of spring washer 146. It has a forwardly extending arm 148 with a tip 150 to which tension spring 152 is secured, the other end of that spring being secured to the lug 138 of the anvil 122 as it extends upwardly through the aperture 142 to a point above the housing wall 121. The anvil actuating lever 144 has a rearwardly extending portion 154 to which member 156 is pivotly secured by means of rivet passing through apertures 159 and 161 in themember 157 and the lever portion 154 respectively; This member 156 is provided with a pair of upwardly extending lugs 158 and 160 which extend to either side of the anvil actuating lever portion 154, thereby to limit the degree to which the member 156 can be pivoted relative to the lever portion 154. The lug 160 extends up to a considerably greaterdistance than the lug 158, for a purpose hereinafter to be described. Therearwardly extending portion of the member 156 is provided with a pairof detent recesses 162 on its upper surface into which the rear tip 164 of the actuating lever is selectively resiliently received, the -locations of the recesses 162 corresponding to the limits of pivotal movement of the member 156 relative to the lever 144. The periphery'of the member 156, which extends out beyond the lever 144, may be serrated, as at 168, in order to facilitate movement of member 156 relative to the lever 144 between its two operative positions, those two operative positions being designated Full and Part, those designations corresponding to rotation of the nozzle over a full circle oo-ntinually in the same direction and rotation of the nozzle back and forth over'part of the circle respectively.

The anvil actuating lever 144 is connected to the anvil 122 by means of the spring 152 disposed between the finger tip 150 and the lug 138. This spring functions as a toggle connection, causing the 122 to be pivoted about the screw 116 as far as it can goin one direction or the. other and causing the anvil actuating lever 144 to pivot about the support member extension shaft 58 as far as it can go in the opposite direction. In a given position of the anvil 122 relative to the housing 144, one or the other of the downwardly turned lugs 132, 134 of the anvil 122 will be positioned in the path of travel of a corresponding one of the pins 136 which rotate with the hammer assembly 66, engagement between the appropriate pin 136 and the corresponding anvil lug 132 or 134 occurring when the hammer assembly 66 is only slightly out of alignment with the nozzle arm 26 in the appropriate direction. Pivoted shifting of the anvil 122 will shift the lugs 132 and 134, moving one ofthem out of the path of travel of the hamrneroarrie-d pins 136 and moving the other into the path of travel of those pins. The anvil 122 is shifted from one of its operative positions to the other through pivotal movement of the anvil actuating lever 144, the shift taking place with a snap-action by reason of the toggle action exerted by the spring 152 when an overcenter shift occurs between the tip 150 of the actuating lever 144 and the lug 138 of the anvil 122.

Non-rotably secured to the upper end of the support member extension shafit 58 is dial looator member 170, here shown in the form of a cap receivable over the upper end of the extension shaft 58 and held in place by screw 172 and washer 174. The outer surface of the dial locator member 170 is provided with a series of vertically extending elongated corrugations 176.

A pair of adjustably positionable elements, here shown in the form of dials 178 and 180, are rotatably received over the dial locator member 170. The lower of these elements, designated 178, comprises a hub 182 connected by means of arm 184 to outer ring 186, the latter being provided with an indicator 188. A lu-g 190 extends down from the arm 184. The arms 184 and hub 182 carry a spring 192 having arms 192a and 192b which resiliently engage with the corrugations 176, thus providing for detenting element 198 as it is rotated.

The upper element 180 comprises a hub 194 which rotatab ly surrounds the upper and uncorrugated portion of the dial locator member 170, from which hub a horizontal wall 196 extends outwardly to :a ring 198 provided with an indicator 200. A lug 202 extends dlovvn from the ring 198. Lugs 190 and 202 are substantially equally radially spaced from the axis of the support member extension shaft 58. A spring 204 is carried by the ring 198 and has arms 204a which engage with the corrugations 176 on the dial locator member 170, thereby to provide for detenting of the adjustableelement 180 as it is moved to desired position. The elements 178 and 180 are retained in position axially on the dial looator member 170 by means of the washer 174 which is received within recess 206 in the upper surface of the element 180..

When the sprinkler is to sprinkle an area of limited arcuate extent the member 156 is so positioned on the anvil actuating lever 144 as to cause the tip 164 of lever 144 to be received within the recess 162 designated Part. This will bring the large upwardly extending lug 160 into a position radially spaced from the axis of the support member extension shaft 58 to substantially the same extent as the lugs 190 and 202 which depend respectively from the adjustable elements 178 and 180. Those adjustable elements 178 and 180 are next individually grasped and rotated against the detenting action of their respective springs 192 and 204 until their indicators 188 and 200 are oriented in the very direction which represent the limits of the area to be sprinkled. The indicators 188 and 200 may be considered as the rear ends of arrows, the shafts of which extend through the axis of the support member extension shaft 58 and point along the lines constituting the limits of the area to be sprinkled.

The water is then turned on, and it will forcibly escape from the nozzle tip 28. In so doing it will engage the vane 84 and, because of the inclination of the hammer surface 88 or 90, it will cause the hammer assembly 66 to pivot in a first direction out of alignment with the nozzle arm 26, this occurring against the action of the spring 106. After the water has pushed the vane 84 out of line with the nozzle arm 26 the spring 108 will tend to restore it to its position in line therewith, causing it to pivot in the opposite direction. The momentum of the hammer assembly 66 will carry it past the nozzle arm 26, the force of the water will cause the vane 84 to pivot about the screw 86, and the water will then force the hammer assembly 66 to continue movement in said opposite direction. While the hammer assembly 66 is thus moving at a relatively high rate of speed the pin 136 carried thereby will strike the anvil lug 132 or 134 which is in its path. Impact exerted upon that lug will be trans- 6 mitted to the housing 114 and, through the posts 34, 36, 38, to the nozzle assembly 22, causing that assembly to move a short distance in the direction in which it is urged by that impact (said opposite direction). The impact will also cause the vane 84 again to pivot about the screw 86, and the force of the water exerted on the newly presented side surface of the vane 84 will tend to move the hammer assembly 66 again in said first direction. This sequence of events will be repeated, with the nozzle assembly 22 moving step-by-step in a given rotative direction. The anvil control arm 144 will move therewith until such time as the upstanding lug 160, located in the same circumferential path as the lugs 190 and 202 depending from the adjustably positionable elements 178 and 180 respectively, is moved into engagement with the appropriate one of those depending lugs 190 and 202. Subsequent movement of the nozzle assembly 22 and the anvil control arm 144 in said given rotative direction will cause the anvil control arm 144 to pivot about the hub 118, and once that pivoting movement is sufficient to cause the spring 152 to operate in an over-center manner, the anvil 122 will be pivotally shifted about the screw 116. Once this occurs that one of its lugs, 132 or 134, which was previously engaged by the appropriate hammer-carried pin 136 will be moved out of the path of travel of the pin 136, and the other of those lugs 132, 134, will be moved into the path of travel of the other hammer-carried pin 136. The same sequence of operation will continue insofar as relationship between the hammer assembly 66 and the nozzle assembly 22 is concerned, except that the operations will be in a reversed sense, and the nozzle will be rotated step-by-step in the opposite direction. This will continue until the lug on the anvil control arm 144 engages the other of the depending lugs 190 or 202, after which the direction of rotation of the nozzle assembly 22 will again be reversed.

Thus the nozzle assembly 22 will continue to sweep back and forth over the arcuate area determined by the positioning of the lugs 190 and 202 depending from the adjustably positionable elements 172 and respectively, those elements 178 and 180 remaining stationary relative to the base 2 of the sprinkler, and hence relative to the ground on which the sprinkler rests, as the sprinkling action takes place. The control elements may be pointed toward the specific limits of the area to be sprinkled by using the indicators 176 and 188.

If continuous step-by-step rotation of the nozzle assembly 22 in a single direction is desired, as when one Wishes to sprinkle a complete circular area, the member 156 is swung about the rivet 157 until the tip 164 of the arm 154 is received within the recess 162 corresponding to the designation Full. This moves the lug 160 out of the circle within which are located the lugs and 202 which depend from the adjustably positionable elements 172 and 180. When this is done the anvil control arm 144, and hence the anvil 122, will constantly remain in the same position, and hence the impulses exerted on the nozzle assembly 22 by the hammer assembly 66 will always be in the same direction.

-It is to be noted particularly that the path of the fluid from the fitting 12 to the nozzle tip 28 is effectively sealed from the other parts of the device. The lower end of the chamber 40 between the stationary support 8 and the nozzle hub 24 is sealed at the bottom by the relatively narrow space between the bearing ring 46 and the support member 8, by the spring-urged pressure of the bearing ring 46 on the shoulder 48, and by the sealing ring 28. The upper end of the chamber 40 is sealed by the springurged gland ring 52 pressed against the plate 54, and by the sealing ring 60 which is pressed into sealing engagement with the gland ring 52, the recessed portion 64 of the nozzle hub 24, and also preferably with the lower surface of the plate 54.

Thus the device of the present invention is capable of great flexibility of use and ready and fool-proof control.

It may be used for sprinkling either-completely around the sprinkler base Zor over an area having only a limited arcuate extent. If the latter mode of operation is selected the particular arc to be sprinkled may be selected through the setting of the adjustably positionable elements 178 and 180 which, when once set, are fixed relative to the ground onwhich the sprinkler rests. Consequently the setting of those elements isdirectly visually related to the particular arcuate area to be sprinkled. That visual relationship remains undisturbed Whether the sprinkler is in operation or at rest, and independently of any particular stepof operation of the sprinkler, and the elements 178 and 180 may be reset atwill, and with full accuracy, even while the sprinkler is in operation.

While but a single embodiment of the present invention has been here disclosed it will be apparent that many variations may be made thereon, all within the scope of the present invention, as defined in the following claims.

We claim:

a 1. A lawn sprinkler comprising a vertically extending stationary support member, a nozzle mounted on said member for-rotation relative thereto about the vertical axis thereof, means including a fluid passage in said support member operatively connected to said nozzle for causing water torissue from said nozzle, means rotatably mounted on said support member independently of said nozzle and operatively connected to said nozzle for causing it to rotate selectively in either direction, and means normally fixedly mounted on and adjustably positionable relative to said support member and active on said nozzle-rotating means for controlling the arc over which saidnozzle rotates.

2. A lawn sprinkler comprising a vertically. extending stationary support member, a nozzle, means for mounting said nozzle on said member for rotation relative thereto about the vertical axis thereof, means operatively connected to said nozzle for causing water to issue from said nozzle, means operatively connected to said nozzle for causing it to rotate selectively in either direction, and means positioned at least partially adjacent the upper end of said support member and above said nozzle mounting means, said last mentioned means being normally fixed and adjustably positionable relative to said support member and active on said nozzle-rotating means for controlling the are over which said nozzle rotates.

3. The combination of claim 2, in which said last mentioned means comprises a pair ofindependently adjustably positionable dial-like elements each accessible at the top of said sprinkler and adjustably controlling a different limit of the arc of rotation of said nozzle and each having an indicator so located thereon as to be directly visually related to the limit of the arc of rotation of said nozzle controlled by the respective element.

4. In the combination of claim 3, a member for selectively conditioning said sprinkler to permit (a) continuous rotation ofsaid nozzle about a complete circle independently of said adjustably positionable elements, or (b) rotation of said nozzle in alternate directions over-a limited are as determined by said adjustably positionable elements, said member being operatively connected to said nozzle located above said nozzle mounting means, .and adjustably positionable relative to said nozzle between (a) a first operative position in which it is operatively disconnected from said adjustably positionable elements and (b) a second operative position in which it is operatively connected to said adjustably positionable elements.

5. A lawn sprinkler comprising a vertically extending stationary support member, a nozzle, means for rotatably mounting said nozzle on said support member, said support member having a fluid passage therethrough with which said nozzle communicates for all relative positions of rotation thereof, said support member extending up above said nozzle mounting means, impulse means, means for oscillatably mounting said impulse means on said support member independently-of said nozzle, said im ulse means being operatively connected 'to said nozzle to cause the latter to rotate step-by-step about said support member, control means operatively engageable with said impulse means to control the direction in which said nozzle is caused to rotate, said control means being carried by said nozzle and adjustably positionable between first and second operative positions relative to said nozzle. for causing rotation of said nozzle in one direction or the other, and a pair of normally fixed and adjustably positionable elements mounted on said support member independently of and above said mounting means for said nozzle and impulse means and having .parts engaged by a part operatively connected to said control means as the latter rotates with said nozzle, thereby to cause said control means to shift from one of its operative positions to the other and thus reverse the direction of rotation of said nozzle.

6. The lawn sprinkler of claim 5, in which said control means part is positioned between said nozzle mounting means and said adjustably positionable elements and is adjustably mounted for movement between a first position engageablewith, and a second position operatively dis connected from, said parts of said adjustably positionable elements, thereby selectively to condition said nozzle respectively to oscillate over a limited are or continuously rotate in a single direction.

7. The lawn sprinkler of claim 6, in which said adjustably positionable elements are dial-like and have in dicators so located thereon as to be directly visually related to the limit of arc of rotation of said nozzle controlled by the respective element.

8. The lawn sprinkler of claim 7, in which said adjustably positionable elements are dial-like and have indicators so located thereon as to be directly visually related to the limit of arc of rotation of said nozzle controlled by the respective element. 7

9.The lawn sprinkler of claim 5, in which said fluid passage and said nozzle are fluid-sealed from the 'remainder of said combination.

10. A lawn sprinkler comprising a support member, a nozzle rotatably mounted on said member, a hammer assembly rotatably mounted on said member independently of said nozzle and a leaf spring operatively connected betweensaid nozzle and said hammer assembly effective to bias the latter toward a predetermined rotative position relative to the former.

11. The lawn sprinkler of claim 10, in which said leaf spring comprises a coiled resilient element extending axially between said hammer assembly and said nozzle and axially slidably connected to at least one of said hammer assembly and said nozzle.

12. A lawn sprinkler comprising a vertically extending stationary support member, a nozzle, means for mounting said nozzle on said member for rotation thereabout, said member having a part extending up above said nozzle mounting means, means operatively connected to said nozzle for causing water to issue therefrom, means supported by said upwardly extending part of said support member and operatively connected to said nozzle for causing it to rotate selectively in either direction, and means normally fixedly mounted onand adjustably positionable relative to said upwardly extending part of said support member and active on said nozzle-rotating means for controlling the are over which said nozzle rotates.

13. The lawn sprinkler of claim 2, in which said nozzlerotating means is mounted on said support member independently of said nozzle.

'14. The lawn sprinkler of claim 2, in which said support member has a part extending up above said nozzle mounting means on which part said nozzle-rotating means is mounted independently of said nozzle, said adjustably positionable means also being mounted on said upwardly extending part of said support member.

15. The lawn sprinkler of claim 2, in which said support member has a part extending up above said nozzle mounting means, means for mounting said nozzle-rotating means on said upwardly extending part independently of said nozzle, said adjustably positionable means also being mounted on said upwardly extending part of said support member above said nozzle mounting means and said means for mounting said nozzle-rotating means.

16. A lawn sprinkler comprising a vertically extending stationary support member, a nozzle, means for rotatably mounting said nozzle on said support member, said support member having a part extending up above said nozzle mounting means, means operatively connected to said nozzle for causing water to issue therefrom, impulse means, means for oscillatably mounting said impulse means on said upwardly extending part of said support member above said nozzle mounting means, said impulse means being operatively connected to said nozzle to cause the latter to rotate step by step about said support member, said impulse means having an aperature therethrough, control means operatively engageable with said impulse means to control the direction in Which said nozzle is caused to rotate, said nozzle having a part extending through said aperture in said impulse means, said control means being carried by said part, located above said impulse means and adjustably positionable between first and second operative positions relative to said nozzle for causing rotation of said nozzle in one direction or the other, and a pair of normally fixed and adjustably positionable elements mounted on said upwardly extending support member part above said mounting means for said nozzle and impulse means and having parts engaged by a part operatively connected to said control means as the latter rotates with said nozzle, thereby to cause said control means to shift from one of its operative positions to the other and thus reverse the direction of rotation of said nozzle.

17. The lawn sprinkler of claim 16, in which said normally fixed and adjustably positionable elements are mounted above said control means.

18. The lawn sprinkler of claim 17, in which said normally fixed and adjustably positionable elements are diallike and are positioned above said control means.

19. The lawn sprinkler of claim 18, in which said control means part is adjustably mounted for movement between a first position engageable with, and a second position operatively disconnected from, said parts of said adjustably positionable elements, thereby selectively to condition said nozzle respectively to oscillate over a limited arc or continuously rotate in a single direction, said control means part having a manually accessible portion extending out laterally beyond said adjustably positionable elements.

References Cited in the file of this patent UNITED STATES PATENTS 2,228,720 Coles et al. Jan. 14, 1941 2,256,737 Englehart Sept. 23, 1941 2,345,030 Bickner Mar. 28, 1944 2,733,958 Warren Feb. 7, 1956 2,769,666 Spender Nov. 6, 1956 2,816,798 Royer Dec. 17, 1957 2,853,342 Kachergis Sept. 23, 1958 2,895,681 Kachergis July 21, 1959 2,928,608 Royer Mar. 15, 1960 

